Reproducibility of Post-Exercise Lactate and Anaerobic Threshold

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Abstract
To test the effect of previous strenuous training on lactate (LA) formation and on changes of lactate threshold (AT) values, a group of seven male athletes aged 26.3 .+-. 9.2 years, height 184 .+-. 6.2 cm, body weight 79.3 .+-. 8.1 kg, percentage of body fat 8.8 .+-. 3.7 and .ovrhdot.VO2 max 56.2 .+-. 5.4 ml/kg were examined on a treadmill to the maximum in the morning after 2 days of rest, and after 2 consecutive days of strenuous training. The subjectively perceived rate of fatigue (SPF) in the morning prior to the exercise test was assessed by means of a 5-grade score. The values of LA max, AT, and SPF on day 1 were 11.06 .+-. 2.4 mmol/l, 3.5 .+-. 0.4 m/s, and 0.6 .+-. 0.4, respectively. The coresponding values on day 2 were 8.8 .+-. 1.7 mmol/l, 4.0 .+-. 0.3 m/s, and 2.0 .+-. 0.5, respectively. The values on day 3 were 8.6 .+-. 1.1 mmol/l, 4.1 .+-. 0.4 m/s, and 2.1 .+-. 0.7, respectively. Statistically significant differences on the 1st day were found in LA max. AT, and SPF compared with days 2 and 3. No significant differences were found between the values for the 2nd and 3rd days. AT values for day 1 were significantly lower than those for days 2 and 3. A significantly higher level of SPF in the morning prior to the test procedure was observed on days 2 and 3 compared with day 1. The AT and SPF values for days 2 and 3 showed no significant difference. These data suggest that not only endurance training but also other factors (e.g., fatigue provoked by repeated strenuous exercise) can affect LA production and AT values.

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